oh...if the ignition coils are bad your car will run sluggish and the cat will turn red. It would apear that the cats are clogged but its online fuel going straight to the cats...On the 400 engine there are two the one you have to change is on driver side of the block. The other is in the front by the thermosat housing. If you think you have a problem with it let me know and I can walk you through it..443-224-6573 Malik